L
logjam
- Jan 1, 1970
- 0
Yeah, I know this part probably hasn't been sold in the past 15 years,
but I can't figure out the data sheet.
The 74S275 Wallace tree has 2 versions. The high speed and basic. In
the high speed version, both C2n inputs are grounded and the carry bit
is passed through 2n+0 to an external adder. I don't understand why
this makes it "high speed" since there is supposed to be an adder
already inside the 275. Is it a "high speed" version because the built
in adders are junk? Or because the built in adders have to pass through
gated buffers?
but I can't figure out the data sheet.
The 74S275 Wallace tree has 2 versions. The high speed and basic. In
the high speed version, both C2n inputs are grounded and the carry bit
is passed through 2n+0 to an external adder. I don't understand why
this makes it "high speed" since there is supposed to be an adder
already inside the 275. Is it a "high speed" version because the built
in adders are junk? Or because the built in adders have to pass through
gated buffers?